Fan



y 1933- E. L. ANDERSON 1,910,225

FAN

Filed March 29, 19.29 2 Sheets-Sheet 1 IN VENTOR EDWARD L. ANZJEPS ON.

3 y M' #bw'w ATTORNEY May 23, 1933. E. L. ANDERSON FAN Filed March 29, 1929 2 Sheets-Sheet 2 [N V/JYVTOR EDWARD L. fl/VDERSDN.

ATTORNEY Patented May 23, 1933 UNITED STATES EDWARD L. ANDERSON, OF GROSSE ILE, MICHIGAN, ASSIGNOR T AMERICAN BLOWER CORPORATION, OF DETROIT, MICHIGAN, A CORPORATION OF DELAWARE FAN Application filed March 29, 1929. I Serial N0. 351,077.

My invention relates to fans. It is the particular object of my invention to provide means of controlling the inlet air of a constant speed fan so as to vary the output of air without varying the fan speed.

I It is a further object to provide means of increasing the rotatable movement'of the incoming air in order to facilitate the entry of the air into the interior of the fan.

It is still a further object of my invention to provide, in combination with this inlet control means, a construction to bring about a venturi action and an injector action be-' tween the inlet air and the back pressure of the air in the casing already in the fan casing. It is an additional object toprovide a fan of the side inlet radial delivery type known as a high-speed fan which is driven by a standard motor at constant speed; with this combination I. provide a venturi inlet with streamlined air control blades which not only control the amount of air entering through the air inlet, but also control the whirling of the air.

Referring to the drawings, Figure 1 is a side elevation from the inlet side of the fan.

Figure 2 is a section of the line 22 of Figure 1.

Figure 3 is a section of the line 33 of Figure 2.

Referring to the drawings in detail, 1 in dicates the side wall of the casing; 2 indi-.

cates the other side wall of the casing in which is mounted the inlet Venturi shaped 5 passageway member 3, having a flaring inner end 4, whose lip 5 is arranged within, and in spaced relationship to, the conical shroud 6 mounted on the inlet ends of the fan blades 7 These fan blades are supported at their other ends by the solid end-plate 8, which in turn is mounted upon the hub 9 of the fan. This hub is carried upon the shaft 10 and is suitably driven by any desirable constant speed motor. The casing is further formed by the scroll 11 which joins the side walls.

This scroll is provided with an outlet opening 12.

In the inlet opening formed by the Venturi shaped passageway 3, there is arranged a plurality of streamlined vanes of airfoil sec tion such as 13. 14 designates the leading edges of these vanes. They are pivoted at 15 on the inlet casing 3, and at 16 on the hub 17 which is carried by the spider 18. The pivotal axis of these vanes 13 intersects with the horizontal axis of the inlet passageway and of the fan designated 18-18 as at 19. These fan blades may be adjusted in position in any desired manner. For instance, the hub in Y which they are pivoted may carry set screws 60 20, engaging the inner pivoted ends of these vanes to hold them in any desired position.

It will be noted that the longitudinal axes of the fan blades are substantially parallel to the axis 1818 of the fan. The back pressure in the'area 21 flows through the open ing 22 between the bell-shaped mouth 4 and the shroud 6, thereby inducing a flow of air over that portion of the fan blades adjacent the shroud which ordinarily would have no incoming air to work upon by reason of turbulence, eddies and other similar conditions set up by back pressure.

Thus, an even distribution of air is secured at all settings of the vanes 13 so that the fan will operate at its maximum efliciency for the amount of air admitted to it. v

I desire to comprehend within my invention such modifications as may be clearly embraced within my claims and the scope of my invention. 7

Having thus fully described my invention what I claim is new and desire to secure by Letters Patent, is:

1. Ina blower, a casing, a fan therein, an inlet passageway, having inwardly tapering walls, air control vanes pivotally' mounted on the walls of said passageway at right angles thereto, a Venturi shaped throat on the inner end of said passageway and projecting 9o ends on said vanes projecting into said throat. 2. In a blower, a fan rotating therein, a. Venturi-shaped inlet passageway having a restricted throat, a hub mounted in said passageway and diagonally-disposed vanes, each being pivotally mounted at its ends on said hub and the passageway wall respectively, said vanes having portions projecting into the Venturi throat of the passageway. In testimony whereof, I aflix my signature.

EDWARD L. ANDERSON. 

